From owner-freebsd-threads@FreeBSD.ORG  Mon May  5 16:54:05 2003
Return-Path: <owner-freebsd-threads@FreeBSD.ORG>
Delivered-To: freebsd-threads@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 6DA8F37B401
	for <threads@freebsd.org>; Mon,  5 May 2003 16:54:05 -0700 (PDT)
Received: from sccrmhc01.attbi.com (sccrmhc01.attbi.com [204.127.202.61])
	by mx1.FreeBSD.org (Postfix) with ESMTP id C653843F75
	for <threads@freebsd.org>; Mon,  5 May 2003 16:54:04 -0700 (PDT)
	(envelope-from julian@elischer.org)
Received: from interjet.elischer.org
	(12-232-168-4.client.attbi.com[12.232.168.4])
	by attbi.com (sccrmhc01) with ESMTP
	id <2003050523540300100cskk6e>; Mon, 5 May 2003 23:54:03 +0000
Received: from localhost (localhost.elischer.org [127.0.0.1])
	by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id QAA30234
	for <threads@freebsd.org>; Mon, 5 May 2003 16:54:03 -0700 (PDT)
Date: Mon, 5 May 2003 16:54:01 -0700 (PDT)
From: Julian Elischer <julian@elischer.org>
To: threads@freebsd.org
Message-ID: <Pine.BSF.4.21.0305051649530.27399-100000@InterJet.elischer.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Subject: kern_threads.c..  upcall question..
X-BeenThere: freebsd-threads@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Threading on FreeBSD <freebsd-threads.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-threads>,
	<mailto:freebsd-threads-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-threads>
List-Post: <mailto:freebsd-threads@freebsd.org>
List-Help: <mailto:freebsd-threads-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-threads>,
	<mailto:freebsd-threads-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 05 May 2003 23:54:05 -0000


In kern_threads.c, in function thread_export_context()
it first does a copyin() of the
context storage area. I think this is un-needed (and a complete waste of
cycles) but I am not sure if there is some strange condition
regarding floating point registers or something that may want this..

Dan, Jon, David?
do any of you have a good reason why I shouldn't remove the copyin().??